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<title>Problem 2457. -- [BeiJing2011]双端队列 -- 衡阳八中OJ离线版-2012-02-29</title><center><h2>2457: [BeiJing2011]双端队列</h2><span class=green>Time Limit: </span>10 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>128 MB<br><span class=green>Submit: </span>39&nbsp;&nbsp;<span class=green>Solved: </span>12<br>[<a href='submitpage.php?id=2457'>Submit</a>][<a href='problemstatus.php?id=2457'>Status</a>][<a href='bbs.php?id=2457'>Discuss</a>]</center><h2>Description</h2><div class=content><div style="margin: 13pt 0cm" align="center"></div>
<div><span style="font-size: 12pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Sherry</span><span style="font-size: 12pt">现在碰到了一个棘手的问题，有Ｎ个整数需要排序。</span></div>
<div><span style="font-size: 12pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Sherry</span><span style="font-size: 12pt">手头能用的工具就是若干个双端队列。</span></div>
<div><span style="font-size: 12pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></div>
<div style="text-indent: 21pt"><span style="font-size: 12pt">她需要依次处理这</span><span style="font-size: 12pt">N</span><span style="font-size: 12pt">个数，对于每个数，</span><span style="font-size: 12pt">Sherry</span><span style="font-size: 12pt">能做以下两件事：</span></div>
<div style="margin: 0cm 0cm 0pt 39pt; text-indent: -18pt"><span style="font-size: 12pt">1．</span><span style="font-size: 12pt">新建一个双端队列，并将当前数作为这个队列中的唯一的数；</span></div>
<div style="margin: 0cm 0cm 0pt 39pt; text-indent: -18pt"><span style="font-size: 12pt">2．</span><span style="font-size: 12pt">将当前数放入已有的队列的头之前或者尾之后。</span></div>
<div style="margin: 0cm 0cm 0pt 21pt">&nbsp;</div>
<div style="text-indent: 21pt"><span style="font-size: 12pt">对所有的数处理完成之后，</span><span style="font-size: 12pt">Sherry</span><span style="font-size: 12pt">将这些队列排序后就可以得到一个非降的序列。</span></div></div><h2>Input</h2><div class=content><div><span style="font-size: 12pt">第一行包含一个整数</span><i><span style="font-size: 12pt">N</span></i><span style="font-size: 12pt">，表示整数的个数。接下来的</span><i><span style="font-size: 12pt">N</span></i><span style="font-size: 12pt">行每行包含一个整数</span><i><span style="font-size: 12pt">D<sub>i</sub></span></i><span style="font-size: 12pt">，其中</span><i><span style="font-size: 12pt">D<sub>i</sub></span></i><span style="font-size: 12pt">表示所需处理的整数。</span></div></div><h2>Output</h2><div class=content><div style="text-indent: 21pt"><span style="font-size: 12pt">其中只包含一行，为</span><span style="font-size: 12pt">Sherry</span><span style="font-size: 12pt">最少需要的双端队列数。</span></div></div><h2>Sample Input</h2>
			<div class=content><span class=sampledata><br />
6<br />
3<br />
6<br />
0<br />
9<br />
6<br />
3<br />
 <br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata><br />
2</span></div><h2>HINT</h2>
			<div class=content><p><p>100%的数据中N&le;200000。</p></p></div><h2>Source</h2>
			<div class=content><p><a href='problemset.html?search=Day1'>Day1</a></p></div><center>[<a href='submitpage.php?id=2457'>Submit</a>][<a href='problemstatus.php?id=2457'>Status</a>][<a href='bbs.php?id=2457'>Discuss</a>]</center>﻿<br>

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